The reason is simple enough - and it’s the reason we will see the same official reaction here in the USA: rioting immigrants/minorities/underclasses offer a government many opportunities to expand its power, while vigilante citizens who take matters into their own hands pose a dire threat to a government’s power.

In the Stockholm suburb of Tumba the police decided to abandon their earlier non-intervention policy as a large group of police officers rounded up and dispersed a group of vigilantes trying to fend off rioters.

Swedes, your government is your main enemy. Apply the Solzhenitsyn Solution.

And how we burned in the camps later, thinking: What would things have been like if every Security operative, when he went out at night to make an arrest, had been uncertain whether he would return alive and had to say good-bye to his family? Or if, during periods of mass arrests, as for example in Leningrad, when they arrested a quarter of the entire city, people had not simply sat there in their lairs, paling with terror at every bang of the downstairs door and at every step on the staircase, but had understood they had nothing left to lose and had boldly set up in the downstairs hall an ambush of half a dozen people with axes, hammers, pokers, or whatever else was at hand?... The Organs would very quickly have suffered a shortage of officers and transport and, notwithstanding all of Stalin's thirst, the cursed machine would have ground to a halt! If...if...We didn't love freedom enough. And even more  we had no awareness of the real situation.... We purely and simply deserved everything that happened afterward.  Alexandr Solzhenitsyn

The next time this happens — and there WILL be a next time — the citizens would be wise to consider the police part of the problem, not part of the solution. Then, once the “vigilantes” have scattered their various enemies, they need to proceed to the police offices and demand that either these deadbeats start doing their jobs or they stop collecting public pay.

The Swiss finalized their no-wars policy of armed neutrality in 1815. Their decentralized citizen army was good enough to keep them out of the Franco-Prussian War of 1870, World War I, and other European gang fights. In 1934, they addressed the looming threat of aerial bombing by starting a massive civil-defense effort. They maintained their citizen army and kept out of World War II, even while provoking Hitler by letting Jews hide their assets in secret Swiss bank accounts. Many Jews only escaped the Holocaust because they had their money where Nazi tax authorities couldnt get it.

Hitler was in fact very provoked by the Swiss. His generals even got as far as giving the invasion of Switzerland the name Operation Tannenbaum and drawing lines on maps for it. However, no matter how they drew the lines, they couldnt overcome the reality that there were no critical central targets for mechanized blitzkrieg to disrupt. Every house in Switzerland was a center of resistance. The Wehrmacht paratroopers couldnt beat a defense that covered every square centimeter of the country with accurate rifle fire, and they knew it.